Dryer and drying method thereof

ABSTRACT

A dryer includes a drum receiving an object to be dried, a first sensor configured to sense a dry state of the object to be dried contained in the drum, a heater configured to heat air supplied into the drum, a blower including a fan forming a flow of air passing through the inside of the drum, a second sensor configured to sense a temperature of air discharged from the drum, and a processor configured to control, when a user input selecting a specific course is received, the drum, the heater, and the blower to perform a dry cycle, to control a rotation direction of the drum on the basis of a dry state of the dry object sensed by the first sensor when the dry cycle is started, and to control termination of the dry cycle on the basis of the temperature of air sensed by the second sensor.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is on the basis of and claims priority under 35 U.S.C. 119 to Korean Patent Application No. 10-2018-0071104, filed on Jun. 20, 2018, the disclosure of which is herein incorporated by reference in its entirety.

BACKGROUND Field

Apparatuses and methods consistent with the disclosure relate to a dryer and a drying method thereof, and more particularly, to a dryer for drying an object to be dried.

Description of the Related Art

Generally, a dryer is a device for performing drying and sterilization by rotating a drum in which a wet object to be dried, for example, clothes or the like, is contained, and applying hot air to the object to be dried for a predetermined time to perform drying and sterilization.

In this case, however, when drying is performed on a bulky object to be dried (or bulky dry object), a dry level of the dry object cannot be accurately detected because the dry object, in a state of being folded or rolled, is rotated together with the drum, and thus, a dry time is inaccurately calculated.

Therefore, there is a demand for a method for more efficiently drying a dry object.

SUMMARY OF THE INVENTION

Embodiments of the disclosure overcome the above disadvantages and other disadvantages not described above. Also, the disclosure is not required to overcome the disadvantages described above, and an embodiment of the disclosure may not overcome any of the problems described above.

The disclosure provides a dryer capable of controlling a rotation direction of a drum on the basis of a dry state of an object to be dried during a dry cycle and controlling termination of the dry cycle on the basis of a temperature of air discharged from the drum.

According to an embodiment of the disclosure, a dryer includes: a drum configured to receive an object to be dried (or dry object); a first sensor configured to sense a dry state of the dry object contained in the drum; a heater configured to heat air supplied into the drum; a blower including a fan forming a flow of air passing through the inside of the drum; a second sensor configured to sense a temperature of air discharged from the drum; and a processor configured to control, when a user input selecting a specific course is received, the drum, the heater, and the blower to perform a dry cycle, to control a rotation direction of the drum on the basis of a dry state of the dry object sensed by the first sensor when the dry cycle is started, and to control termination of the dry cycle on the basis of a temperature of air sensed by the second sensor.

The processor may change the rotation direction of the drum on the basis of the dry state of the dry object sensed by the first sensor.

The processor may rotate the drum in a first direction during the dry cycle, rotate the drum in a second direction opposite to the first direction for a predetermined time if a value indicating the dry state of the dry object sensed by the first sensor is equal to or less than a predetermined value, and additionally perform the dry cycle when the predetermined time elapses.

If the value indicating the dry state of the dry object sensed by the first sensor is equal to or less than the predetermined value after the dry cycle is additionally performed, the processor may determine a time for which the dry cycle is to be additionally performed on the basis of a time which has elapsed since the start of the dry cycle, and additionally perform the dry cycle for the determined time.

The processor may rotate the drum in the second direction for the predetermined time at a specific predetermined time period during the additionally performed dry cycle.

The heater may include a compressor configured to heat air supplied into the drum.

The processor may control ON/OFF of the compressor on the basis of a temperature sensed by the second sensor during the dry cycle performed after the rotation direction of the drum is controlled, and control termination of the dry cycle on the basis of a control state of the compressor.

The dry cycle performed after the rotation direction of the drum is controlled may be set to be performed for a time determined on the basis of the time which has elapsed from the time point at which the dry cycle was started.

If the number of times the compressor has been turned off is a predetermined value, the processor may terminate the dry cycle even before the determined time has elapsed.

The processor may turn off the compressor in operation if the temperature sensed by the second sensor is a predetermined first temperature, and when a temperature sensed by the second sensor after the compressor is turned off is a predetermined second temperature, the processor may turn on the compressor which is in an OFF state.

According to another embodiment of the disclosure, a drying method of a dryer including a drum configured to receive an object to be dried (or a dry object), a first sensor configured to sense a dry state of the dry object contained in the drum, and a second sensor sensing a temperature of air discharged from the drum, includes: performing a dry cycle when a user input selecting a specific course is received; controlling a rotation direction of the drum on the basis of a dry state of the dry object sensed by the first sensor after the dry cycle is started; and controlling termination of the dry cycle on the basis of a temperature of air sensed by the second sensor.

The controlling of a rotation direction may include changing the rotation direction of the drum on the basis of the dry state of the dry object sensed by the first sensor.

The controlling of a rotation direction may further include rotating the drum in a first direction during the dry cycle and rotating the drum in a second direction opposite to the first direction for a predetermined time if a value indicating the dry state of the dry object sensed by the first sensor is equal to or less than a predetermined value, wherein the drying method may further include: resuming the dry cycle after the lapse of the predetermined time.

The drying method may further include: if a value indicating the dry state of the dry object sensed by the first sensor is equal to or less than the predetermined value after the dry cycle is additionally performed, determining a time for which the dry cycle is to be additionally performed on the basis of a time which has elapsed since the start of the dry cycle, and additionally performing the dry cycle for the determined time.

The additionally performing of the dry cycle may further include: rotating the drum in the second direction for the predetermined time at a specific predetermined time period during the additionally performed dry cycle.

The dryer may further include: a compressor configured to heat the air supplied into the drum.

The controlling of termination of the dry cycle may include: controlling ON/OFF of the compressor on the basis of the temperature sensed by the second sensor during the dry cycle performed after the rotation direction of the drum is controlled, and controlling termination of the dry cycle on the basis of a control state of the compressor.

The dry cycle performed after the rotation direction of the drum is controlled may be set to be performed for a time determined on the basis of the time which has elapsed from the time point at which the dry cycle was started.

In the controlling of termination of the dry cycle, if the number of times the compressor has been turned off is a predetermined value, the dry cycle may be terminated even before the determined time has elapsed.

The drying method may further include: turning off the compressor in operation if the temperature sensed by the second sensor is a predetermined first temperature, and turning on the compressor which is in an OFF state if a temperature sensed by the second sensor after the compressor is turned off is a predetermined second temperature.

Additional and/or other aspects and advantages of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

BRIEF DESCRIPTION OF THE DRAWING FIGURES

The above and/or other aspects of the disclosure will be more apparent by describing certain embodiments of the disclosure with reference to the accompanying drawings, in which:

FIGS. 1 and 2 are perspective views illustrating a dryer according to an embodiment of the disclosure;

FIG. 3 is a block diagram illustrating a configuration of a dryer according to an embodiment of the disclosure;

FIG. 4 is a view illustrating a configuration of a dryer according to an embodiment of the disclosure;

FIGS. 5 through 9 are views illustrating a drying method according to various embodiments of the disclosure; and

FIG. 10 is a flowchart illustrating a drying method according to an embodiment of the disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Hereinafter, various embodiments of the disclosure will be described in detail with reference to the accompanying drawings.

The terms used in the example embodiments of the disclosure are general terms which are widely used now and selected considering the functions of the disclosure. However, the terms may vary depending on the intention of a person skilled in the art a precedent, or the advent of new technology. In addition, in a specified case, the term may be arbitrarily selected. In this case, the meaning of the term will be explained in the corresponding description. Therefore, terms used m the disclosure may be defined on the basis of a meaning of the terms and contents described in the disclosure, not simply on the basis of names of the terms.

Throughout the specification, unless explicitly described to the contrary, the word “comprise” and variations such as “comprises” or “comprising”, will be understood to imply the inclusion of stated elements but not the exclusion of any other elements. Further, in the disclosure, a “module” or a “part” performs at least one function or operation and may be realized h hardware or software or a combination of the hardware and the software.

Hereinafter, embodiments of the disclosure will be described in detail with reference to the accompanying drawings. The embodiments most appropriate to help understand the technical features of the disclosure will be described, and the technical features of the disclosure are not limited by the described embodiments and merely illustrate the implementation of the disclosure through the embodiments described hereinafter.

Thus, the disclosure may be variably modified within the scope of the disclosure through the embodiments described below, and such modifications are within the scope of the disclosure. In order to help understand the embodiments described hereinafter, the like or similar reference numerals are used for relevant components among the components having the same function in the respective embodiments in the accompanying drawings. Further, in the drawings, the shapes and dimensions of elements may be exaggerated for clarity.

FIG. 1 is a perspective view illustrating a dryer according to an embodiment of the disclosure.

The dryer 100 (or a clothes dryer) described below is a device for drying an object to be dried (or dry object) by supplying hot and dry air to a dry chamber containing the dry object. The dry object includes any object which can be dried and sterilized through hot air. For example, the dry object includes, but is not limited to, various kinds of fibers, fabrics, such as cloth, clothes, towels, blanket, and the like.

As illustrated in FIG. 1, the dryer 100 includes a main body 10 which forms an appearance. The main body 10 may have a rectangular parallelepiped shape extending in an up-down direction. However, it is to be understood that the body 10 is an example for the purposes of description and may be realized in various other shapes.

The main body 10 may include a front panel 11, an upper panel 12, a side/rear panel 13.

The main body 10 includes an opening 10H (see FIG. 2) formed on one side thereof and the opening 10H provided on the front panel 11 may be opened to a front side of the main body 10. In this case, a door 14 may be coupled to the main body 10 to open and close the opening 10H.

A control panel 15 may be disposed at an upper end of the front panel 11.

The control panel 15 includes an operating part 15-1 for inputting an operation command for operating the dryer 100 and a display 15-2 for displaying operation information of the clothes dryer 100.

In this case, the user may input various user commands for operating the dryer 100 through the operating part 15-1. To this end, the operating part 15-1 may include a button, an operation dial, and the like.

For example, the user may select a desired course (or cycle) through the button or the operation dial provided on the operating part 15-1.

The display 15-2 may display operation information of the dryer 100 as a visual image. Here, the display 15-2 may be configured as a touch screen capable of receiving a user's operation command.

FIG. 2 is a perspective view illustrating a state in which the door 14 of the dryer 100 illustrated in FIG. 1 is open.

As illustrated in FIG. 2, the opening 10H is formed on one side of the main body 10, and the opening 10H may be formed to have a circular shape on the front panel 11.

A drum 110 may be rotatable disposed inside the main body 10 and may be connected to the opening 10H, and thus, a dry object may be introduced into the drum 10 through the opening 10H.

Specifically, the drum 110 includes a dry chamber (not shown) connected to the opening 10H, and the dry object introduced into the dry chamber (not shown) through the opening 10H may be dried by hot air.

Meanwhile, a motor (not shown) is provided inside the main body 10, and the drum 110 may be rotated according to rotation of the motor (not shown). Accordingly, the dry object (not shown) introduced into the dry chamber (not shown) may be tumbled and hot air may be evenly applied to the dry object.

The door 14 is coupled to the front panel 11 of the main body 10 to open and close the opening 10H.

The door 14 is pivotably coupled to the front panel 11, thereby opening and closing the opening 10H.

Specifically, as illustrated in FIG. 2, a hinge 14-1 may be disposed on one side of the front panel 11 adjacent to the opening 10H, and the door 14 may be connected to the hinge 14-1 and rotated with respect to the hinge 14-1 to thereby open and close the opening 10H.

The door 14 may have a circular shape corresponding to the shape of the opening 10H and has a diameter larger than a diameter of the opening 10H. Accordingly, the dry object may be introduced into the dry chamber (not shown) of the drum 110 through the opening 10H when the door 14 is opened.

FIG. 3 is a block diagram illustrating a configuration of a dryer according to an embodiment of the disclosure.

Referring to FIG. 3, the dryer 100 includes the drum 110, a first sensor 120, a second sensor 130, a heater 140, a blower 150, and a processor 160.

The drum 110 receives a dry object. To this end, the drum 110 includes the dry chamber (not shown) for receiving the dry object, and the dry object may be dried by air flowing to the dry chamber (not shown).

In this case, the drum 110 is rotatably disposed, and the dry object placed in the dry chamber (not shown) is tumbled according to rotation of the drum 110 and air may be evenly applied to the dry object.

The first sensor 120 senses a dry state of the dry object contained in the drum 110. That is, the first sensor 120 is provided inside the drum 110 to sense a dry state of the dry object. To this end, the first sensor 120 may include a dryness detection sensor.

In this case, the dryness detection sensor includes two electrodes provided inside the drum 110. When the dry object is placed between the two electrodes, the dryness detection sensor detects a dry state of the dry object on the basis of a magnitude of current flowing between the two electrodes and generate a value indicating a dry state of the dry object, i.e., sensing data (e.g., a pulse value). For example, current easily flows between the two electrodes as a moisture content of the dry object placed between the two electrodes is higher and does not easily flow between the two electrodes as the moisture content of the dry object placed between the two electrodes is lower, and thus, the dryness detection sensor may generate low sensing data as the dry object is drier, and generate high sensing data as the dry object is wetter.

However, this is merely an example, and the first sensor 120 may be realized as various types of sensors for measuring dryness (i.e., the degree of drying) of the dry object.

The second sensor 130 senses a temperature of air discharged from the drum 110. To this end, the second sensor 130 may include a temperature detection sensor. In this case, the temperature detection sensor is disposed in a filter (49 in FIG. 4) to sense the temperature of the air discharged from the drum 110 and to generate a value indicating the temperature of the air, that is, sensing data.

However, this is merely an example, and the temperature detection sensor may sense the temperature of the drum 110 at various positions.

The heater 140 heats air supplied into the drum 110.

In this case, the heater 140 may heat the air supplied into the drum 110 through various methods.

For example, the heater 140 includes a compressor (46 in FIG. 4) connected to a flow path and cooling and heating air circulating in the flow path and air supplied into the drum 110 may be heated through the compressor.

The blower 150 may form a flow of air passing through the inside of the drum 110. In this case, the blower 150 may include a fan (41 in FIG. 4) for generating a flow of air according to rotation.

The processor 160 controls an overall operation of the dryer 100.

Specifically, the processor 160 may control a rotation speed and a rotation direction of the drum 110, a temperature of air discharged from the drum 110, and a rotation speed of the fan.

To this end, the processor 160 may be connected to various components included in the dryer 100 and transmit and receive various data and signals. The processor 160 may generate control commands and transmit the generated control command to control various components included in the dryer 100.

In this case, the processor 160 may control hardware or software components connected to the processor 160 and perform various data processing and calculation by driving, for example, an operating system or an application program. In addition, the processor 160 may load instructions or data received from at least one of the other components into a volatile memory, process the loaded command or data, and store various data in a non-volatile memory.

To this end, the processor 160 may be realized as a general-purpose processor (CPU, GPU or application processor) capable of performing the corresponding operations by executing one or more software programs stored in a memory device or a dedicated processor (e.g., an embedded processor) for performing the corresponding operations.

In particular, the processor 160 may control a rotation direction of the drum 110 in a dry cycle performed according to blanket dry course and control termination of the dry cycle on the basis of a temperature discharged from the drum 110.

Hereinafter, a process performed by the dryer 100 in the blanket dry course according to various embodiments will be described in detail.

According to various embodiments of the disclosure, the dryer 100 may be realized as a heat pump dryer. A configuration of the dryer 100 realized as the heat pump dryer will be described with reference to FIG. 4 hereinafter.

FIG. 4 is a view illustrating a configuration of a dryer according to an embodiment of the disclosure.

The fan 41 generates a flow of air as it rotates. In this case, the fan 41 is driven according to an inverter motor (or motor) (not shown), and a rotation speed and rotation direction of the fan 41 may be changed under the control of the inverter motor (not shown).

Meanwhile, air may be circulated through a flow path 42 according to rotation of the fan 41 and may be introduced into and discharged from the drum 110.

In this case, in order to dry the dry object contained in the drum 110, the air discharged from the drum 110 may flow into the drum 110 again through a condensation and heating process.

That is, the flow path 42 is a circulation passage for air discharged from the drum 110 and flowing into the drum 110, and the fan 41 rotates to cause air to flow into the drum 110 to circulate air through the flow path 42.

Meanwhile, the dryer 100 may include a heat pump system 43 for condensing and heating air through a refrigerant.

In this case, the refrigerant is circulated, while flowing in order of an evaporator (EVA) 45, the compressor 46, a condenser 44, and an expander 48 through a refrigerant pipe 47.

Specifically, the refrigerant absorbs heat and evaporates in the evaporator (EVA) 45. Accordingly, the evaporator (EVA) 45 cools the circulating air through the heat exchange between the refrigerant and the circulating air to condense moisture. In this case, the condensed moisture may be discharged to the outside of the dryer 100 through a pipe (not shown).

Meanwhile, the compressor 46 compresses the refrigerant flowing from the evaporator (EVA) 45 and discharges the compressed refrigerant to the condenser 44.

In this case, the compressor 46 is driven by an inverter motor (not shown), and the rotation speed of the compressor 46 may be varied under the control of the inverter motor (not shown). That is, an operating frequency (or driving frequency) of the compressor 46 may be varied. Alternatively, the compressor 46 may be driven by a constant speed motor (not shown) and may be driven to have a constant operating frequency under the control of the constant speed motor (not shown).

In the condenser 44, the refrigerant emits heat to perform condensing. Therefore, the condenser 44 heats the circulating air through heat exchange between the refrigerant and the circulating air.

The expander 48 expands the refrigerant flowing from the condenser 44 and discharges the expanded refrigerant to the evaporator (EVA) 45.

The condensation process and the heating process of the circulating air are performed through the heat pump system 43, and the circulating air flows again into the drum 110.

Specifically, the high-temperature, low-humidity air heated by the condenser 44, while passing through the dry object in the drum 110, turns to high-temperature, high-humidity air, and the high-temperature, high-humidity air, while passing through the evaporator (EVA) 45, is dehumidified to turn to a low-temperature, low-humidity air. The low temperature, low-humidity air is heated by the condenser 44 to turn to high temperature, low-humidity air and then flows to the drum 110.

The filter 49 may be provided between the drum 110 and the evaporator (EVA) 45 to remove foreign matter such as lint or the like in the air.

As described above, the dryer 100 is realized as a heat pump dryer dries the dry object through the components illustrated in FIG. 4.

Hereinafter, a method of performing a blanket dry course by the dryer 100 including the configuration as illustrated in FIG. 4 will be described in detail with reference to FIG. 5.

First, referring to FIG. 5, when a user input for selecting a specific course is received, the processor 160 may control the drum 110, the heater 140, and the blower 150 to perform a drying process.

Here, a specific course may include a blanket dry course for drying blanket. In this case, the user input for selecting the blanket dry course may be input through the operating part (15-1 in FIG. 1) provided in the dryer 100. For example, the user may select the blanket dry course by selecting a button provided on the operating part 15-1 or rotating an operation dial provided on the operating part 15-1.

Meanwhile, the processor 160 may perform pre-processing before performing the dry cycle (S510).

Specifically, the processor 160 drives the fan 41 and the drum 110, and may drive the compressor 46 when a specific time expires.

In this case, the processor 160 may drive the fan 41 and the drum 110 at a predetermined speed and drive the compressor 46 at a predetermined operating frequency.

For example, when the compressor 46 is driven by the inverter motor (not shown), the processor 160 may gradually increase the operating frequency for a predetermined time after driving the compressor 46, maintain the increased operating frequency for a predetermined time, and may subsequently gradually increase the operating frequency of the compressor 46 until a target operating frequency is reached.

Thus, the processor 160 may allow an internal temperature of the drum 110 to reach a target temperature by performing pre-processing before performing the dry cycle, thereby increasing drying efficiency.

In another example, when the compressor 46 is driven by the constant speed motor (not shown), the processor 160 may drive the compressor 46 at a constant operating frequency.

Meanwhile, when the pre-processing is completed, the processor 160 may perform dry cycle (S515).

Here, the dry cycle may refer to a cycle for drying the dry object contained in the drum 110.

More specifically, when the dry cycle is started, the processor 160 may drive the compressor 46 at a predetermined operating frequency, drive the fan 41 at a predetermined rotation speed, and drive the drum 110 at a predetermined rotation speed. Here, the processor 160 may rotate the drum 110 in a first direction e.g., a clockwise direction).

Accordingly, during the dry cycle, high temperature, low humidity air generated by the compressor 46 during the rotation of the drum 110 is supplied into the drum 110 by the fan 41 and the dry object contained in the drum 110 may be dried by the air supplied into the drum 110.

The processor 160 may control a rotation direction of the drum 110 on the basis of a dry state of the dry object detected by the first sensor 120 after the dry cycle is started. Specifically, the processor 160 may change the rotation direction of the drum 110 on the basis of the dry state of the dry object detected by the first sensor 120.

In this case, first, the processor 160 may determine whether a specific time has not elapsed yet since the dry cycle was started (S520). That is, the processor 160 may determine whether a time taken for performing the dry cycle is equal to or less than a predetermined value (T₁ minutes, e.g., 357 minutes).

If the specific time has elapsed since the start of the dry cycle (S520-N), the processor 160 may terminate the dry cycle (S555) and perform a cooling process (S560).

However, if the specific time has not elapsed yet since the start of the dry cycle (S520-Y), the processor 160 may determine whether a value indicating the dry state of the dry object sensed by the first sensor 120 is a predetermined value (S525).

Specifically, the processor 160 may determine whether sensing data sensed by the first sensor 120, for example, a pulse value, is equal to or less than a predetermined value S₁. Here, the predetermined value S₁ may be 0 or a value close to 0.

In this case, if the value indicating the dry state of the dry object sensed by the first sensor 120 is not equal to or less than the predetermined value (S525-N), the processor 160 may repeatedly determine whether the value sensed by the first sensor 120 is the predetermined value during the dry cycle (S515).

Meanwhile, the processor 160 may change the rotation direction of the drum 110 when the value indicating the dry state of the dry object sensed by the first sensor 120 is equal to or less than the predetermined value. That is, the processor 160 may change the direction of rotation of the drum 110 when the pulse value is equal to or less than the predetermined value S₁.

Specifically, the processor 160 may change the rotation direction of the drum 110 in the second direction (e.g., a counterclockwise direction) in that the drum 110 rotates in the first direction during the dry cycle process. Also, the processor 160 may rotate the drum 110 in a second direction opposite to the first direction for a predetermined time (t₁ seconds) (e.g., 10 seconds) (S530).

In this case, the processor 160 may keep the operating frequency of the compressor 46, the rotation speed of the fan 41, and the rotation speed of the drum 110 the same as in the dry cycle.

Thereafter, the processor 160 may perform the dry cycle again when the predetermined time (t₁ seconds) has elapsed (S535).

That is, the processor 160 may drive the compressor 46 at the predetermined operating frequency, drive the fan 41 at the predetermined rotation speed, and change the rotation direction of the drum 110 to the first direction, and drive the drum 110 in the first direction at the predetermined rotation speed.

Thereafter, the processor 160 may determine whether a value indicating a dry state of the dry object sensed by the first sensor 120 is a predetermined value (S540).

Specifically, the processor 160 may determine whether sensing data sensed by the first sensor 120, e.g., the pulse value, is equal to or less than a predetermined value S₁. Here, the predetermined value S1 may be 0 or a value close to 0.

In this case, if the value indicating the dry state of the dry object sensed by the first sensor 120 is not equal to or less than the predetermined value (S540-N), the processor may repeatedly determine whether the value sensed by the first sensor 120 is equal to or less than the predetermined value in the drying process (S535).

Meanwhile, if the value indicating the dry state of the dry object sensed by the first sensor 120 is equal to or less than the predetermined value, the processor 160 may determine a time for additionally performing the dry cycle on the basis of a time which has elapsed since the start of the dry cycle.

To this end, the processor 160 may determine the time which has elapsed from the time point at which the dry cycle was started.

Specifically, the processor 160 may terminate pre-processing, change the rotation direction of the drum 110 one time from the time point at which dry cycle was first started (i.e., time point at which dry cycle was started in S515), return to the original state, and thereafter, determine the elapsed time to a time point at which the value sensed by the first sensor 120 is equal to the predetermined value (that is, a time point at which a pulse value corresponding to a value equal to or less than the predetermined value S₁ in S540).

Then, the processor 160 may determine a time for additionally performing the dry cycle on the basis of the elapsed time.

In this case, the processor 160 may determine the time for additionally performing the dry cycle using the elapsed time and the information stored in the memory (not shown) of the dryer 100.

Here, the information stored in the memory (not shown) indicates for how long the dry cycle is to be additionally performed according to the measured elapsed time, for example, as illustrated in Table 1 below. The values were experimentally measured for optimal drying of the dry object.

TABLE 1 Measured elapsed time (T) Additional dry time T ≤ 8 minutes 110 minutes − measured elapsed time (T) 8 minutes < T ≤ 15 minutes 140 minutes − measured elapsed time (T) 15 minutes < T ≤ 20 minutes 170 minutes − measured elapsed time (T) 20 minutes < T ≤ 25 minutes 200 minutes − measured elapsed time (T) 25 minutes < T 230 minutes − measured elapsed time (T)

For example, in Table 1, if the elapsed time is 22 minutes T=22 minutes), the processor 160 may determine 148 minutes (=170 minutes−22 minutes) as the time for additionally performing the dry cycle.

Thereafter, the processor 160 may additionally perform the dry cycle for the determined time (S545).

Here, the processor 160 may display the time for additionally performing the dry cycle on the display 15-2.

In case of the above example, if the time for additionally performing the dry cycle is determined to be 148 minutes, the processor 160 may display text such as “148 minutes remains” on the display 15-2.

Meanwhile, the processor 160 may rotate the drum 110 in the second direction for a predetermined time (t₁ sec) at a specific time (T₂ minutes) period in the additional dry cycle (S545).

That is, when the dry cycle is performed, the processor 160 may drive the compressor 46 at a predetermined operating frequency, drive the fan 41 at a predetermined rotation speed, and drive the drum 110 at a predetermined rotation speed. Here, the processor 160 may rotate the drum 110 in the first direction.

In this case, the processor 160 may rotate the drum 110 in the second direction for t₁ seconds (e.g., 10 seconds) every T₂ minutes e.g., 10 minutes), while the dry cycle is performed.

That is, when T₂ minutes has elapsed, since the dry cycle was started, the processor 160 changes the rotation direction of the drum 110 rotating in the first direction to the second direction, rotates the drum. 110 in the second direction for t₁ seconds, and when t₁ seconds has elapsed, the processor 160 changes the rotation direction of the drum 110 to the first direction and rotates the drum 110 in the first direction. Thereafter, when T₂ minute has elapsed, the processor 160 may change the rotation direction of the drum 110 rotating in the first direction to the second direction, rotate the drum 110 in the second direction for t₁ seconds, and when t₁ seconds has elapsed, the processor 160 may change the rotation direction of the drum 110 to the first direction. The processor 160 may repeatedly perform this process.

Meanwhile, while the dry cycle is being performed, the processor 160 may determine whether a temperature of the air inside the drum 110 has reached a predetermined target temperature on the basis of a temperature sensed by the second sensor 130.

That is, during the dry cycle, the temperature of the air inside the drum 110 gradually increases due to the high-temperature, low-humidity air generated by the compressor 46, and thus, a temperature sensed by the second sensor 130 also increases gradually.

Accordingly, when the temperature sensed by the second sensor 130 reaches a predetermined value, the processor 160 may determine that the temperature of the air inside the drum 110 has reached the predetermined target temperature.

In this case, if the temperature sensed by the second sensor 130 is a predetermined first temperature, the processor 160 may turn off the compressor 46 being driven. For example, the processor 160 may turn off the compressor 46 when the temperature sensed by the second sensor 130 increases to 57° C.

Meanwhile, when the compressor 46 is stopped, the temperature of the air inside the drum 110 gradually decreases. Accordingly, the temperature sensed by the second sensor 130 also gradually decreases.

In this case, when the temperature sensed by the second sensor 130 is a predetermined second temperature, the processor 160 may turn on the compressor 46. For example, the processor 160 may turn on the compressor 46 in the OFF state when the temperature sensed by the second sensor 130 gradually decreases to 56° C.

In this way, the processor 160 may control ON/OFF of the compressor 46 on the basis of the temperature sensed by the second sensor 130, thereby performing the dry cycle.

Thereafter, the processor 160 may terminate the dry cycle (S555) when the dry time set for the additional dry cycle has elapsed (S550-Y). That is, the processor 160 may perform the dry cycle by the set dry time and terminate the dry cycle.

The processor 160 may perform a cooling process (S560).

Specifically, the processor 160 may stop the operation of the compressor 46 and increase the rotation speed of the fan 41. This is to increase an air volume by the fan 41 to lower the temperature in the drum 110 rapidly.

Thereafter, the processor 160 may terminate the cooling process when the temperature sensed by the second sensor 130 reaches a predetermined temperature.

That is, the temperature inside the drum 110 gradually decreases as the fan 41 is driven, and thus, the temperature value indicated by data sensed by the second sensor 130 also gradually decreases.

Accordingly, when the temperature sensed by the second sensor 130 gradually decreases to a predetermined temperature, the processor 160 may stop driving the fan 41, the drum 110, and the like, to terminate the cooling process.

Meanwhile, in the disclosure, as described above, the rotation direction of the drum 110 is changed in the course of performing the dry cycle on the dry object, and thereafter, a time for additionally performing the dry cycle is determined, and a reason therefor is as follows.

The fact that the pulse value sensed by the first sensor 120, e.g., the dryness detection sensor, corresponds to 0 (or a value close to 0) or less means that the dry object or part of the dry object in contact with the dryness detection sensor has been dried.

Meanwhile, in case of a blanket, the blanket has a large volume, and thus, if the drum 110 is rotated in one direction, the blanket, which is maintained in a folded or rolled state, rotates together with the drum 110, without a head motion or without being rarely changed in position inside the drum. Accordingly, a portion in direct contact with the dryness detection sensor is limited, and therefore, a value sensed by the dryness detection sensor may be considered to be a value indicating a dry state of a partial surface of the blanket which is exposed to hot air and rapidly dried, rather than a dry state of the entire blanket.

Thus, if the time for performing the dry cycle is determined on the basis of such a dry state, the dry cycle may be terminated in a state that a folded inner side of the blanket is not dried but still wet and drying needs to be performed repeatedly, causing user inconvenience.

Therefore, in the disclosure, a dry state of the dry object is more accurately measured by changing a position of the load, that is, a position of the dry object, as much as possible in the drum 110 by reversely rotating the drum 110, and a time for additionally performing the dry cycle is determined accordingly, whereby the dry object may be more effectively dried.

In addition, because the rotation direction of the drum 110 is periodically changed during the dry cycle, the blanket may be dried as a whole.

Meanwhile, in case of the blanket, the time required for drying the blanket varies depending on a thickness, a material, and a type and density of a filler thereof, and even the same blanket may be varied in the time required for drying depending on a difference in an initial moisture content according to a degree of dewatering.

For example, a summer blanket is thinner and has a less amount of filler than a winter blanket, and thus, a time required for drying the summer blanket is generally shorter than a time required for drying the winter blanket. Also, a blanket which is smaller or has less initial moisture content requires a shorter dry time than a blanket which is larger or has a greater initial moisture content.

Therefore, performing additional dry cycle without considering these points may damage the blanket due to overdrying or may not be desired in terms of energy efficiency.

Accordingly, in the disclosure, the additional dry cycle may be terminated depending on the temperature of the air discharged from the drum 110 even before the set time for the additional dry cycle arrives.

Specifically, the processor 160 may control ON/OFF of the compressor 46 on the basis of the temperature sensed by the second sensor 130 in the dry cycle performed after the rotation direction of the drum 110 is controlled, and terminate the dry cycle on the basis of a control state of the compressor 46.

Here, the dry cycle, which is performed after the rotation direction of the drum 110 is controlled, may be a dry cycle set to be performed for the time determined on the basis of the time which has elapsed since the start of the dry cycle.

That is, as described above, in the disclosure, the rotation direction of the drum 110 is changed in the course of performing the drying process on the dry object, the time for the additional drying process is determined according to the measured elapsed time, and the dry cycle is additionally performed for the determined time. Here, the dry cycle performed after the rotation direction of the drum 110 is controlled may refer to a dry cycle which is additionally performed.

In this case, if the control state of the compressor 46 satisfies a specific condition (S550-Y) while the dry cycle is additionally performed, the processor 160 may terminate the dry cycle (S555). Then, the processor 160 may proceed with the cooling process (S560).

Specifically, when the number of times the compressor 46 is turned off is a predetermined value, the processor 160 may terminate the dry cycle even before the determined time expires.

That is, as described above, when the temperature detected by the second sensor 130 is a predetermined first temperature during the dry cycle, the processor 160 turns off the compressor 46. In this case, the processor 160 may count and store the number of times the compressor 46 is turned off.

Accordingly, when the number of times the compressor 46 is turned off is a predetermined value (e.g., three times), the processor 160 may terminate the dry cycle even before the set time for performing the dry cycle expires.

As in the above example, it is assumed that the time for performing the dry cycle is set to 148 minutes. In this case, if the compressor 46 is turned off three times, the processor 160 may terminate the dry cycle, rather than further performing the dry cycle, although 148 minutes has not elapsed since the start of the additional dry cycle.

That is, as described above, in the dry cycle, the temperature of the inside of the drum 110 gradually rises as the compressor 46 is driven. The processor turns off the compressor 46 when the temperature of the inside of the drum 110 reaches a target temperature, and turns on again the compressor 46 when the temperature inside the drum 110 falls to a specific temperature.

In this case, a large number of times the compressor 46 is turned off within a predetermined time means that the temperature inside the drum 110 rapidly rises from the specific temperature to the target temperature, which may mean that the dry object contained in the drum 110 has been dried to some extent.

Therefore, performing the dry cycle continuously on the dry object which has been completely dried may damage the dry object and may not be desirable in terms of energy efficiency.

Accordingly, in the disclosure, in order to reduce damage to the dry object and increase energy efficiency, the dry cycle is terminated if the dry object is determined to have been completely dried to some extent, although the time set for performing the dry cycle on the dry object has not elapsed yet.

In the above-described example, the drum 110 is reversely rotated once, but this is merely an example. That is, according to various embodiments, the number of times the drum 110 is rotated in the reverse direction may vary depending on a dry state of the dry object, details of which will be described with reference to FIG. 6.

FIG. 6 is a view illustrating a method of performing a dry cycle according to an embodiment of the disclosure.

In FIG. 6, operations of S610, S615, S625, S630, S635, S640, S645, S650, S655, and S660 are the same steps S510, S515, S525, S530, S535, S540, S545, S550, S555, S560 of FIG. 5, and thus, details descriptions thereof will be omitted. In addition, although the operation of determining whether a specific time has elapsed since the dry cycle was started (e.g., S520 of FIG. 5) is not illustrated, such an operation may also be performed in FIG. 6.

Referring to FIG. 6, the processor 160 may determine whether a value indicating a dry state of the dry object sensed by the first sensor 120 is equal to or less than a predetermined value (S640).

Specifically, the processor 160 may determine whether the sensing data sensed by the first sensor 120, i.e., a pulse value, is equal to or less than the predetermined value S₁. Here, the predetermined value S₁ may be 0 or a value close to 0.

In this case, when the value indicating the dry state of the dry object sensed by the first sensor 120 is equal to or less than the predetermined value, the processor 160 may determine a time taken for a value sensed by the first sensor to reach the predetermined value since the drum 110 was reversely rotated, and determine whether the determined time is equal to or less than a predetermined time (T₃ minutes) (S670). Here, the predetermined value (T₃ minutes) may be, for example, 1 minute.

In this case, if the determined time is greater than the predetermined value (S670-N), the processor 160 may reversely rotate the drum 110 again and perform the dry cycle and determine whether a value sensed by the first sensor 120 is equal to or less than the predetermined value.

Here, if the determined time is equal to or less than the predetermined value (S670-Y), the processor 160 may perform an additional dry cycle (S645).

The value indicating the dry state of the dry object, which has reached the predetermined value within a short time after the drum 110 is reversely rotated may indicate that the blanket has been dried as a whole, and according to an embodiment of this disclosure, the number of times the drum 110 is reversely rotated may be adjusted until the blanket is dried as a whole, and thereafter, the additional dry cycle may be performed. In this case, the additional dry cycle time may be less than the dry cycle time performed in FIG. 5.

In the example described above, when the number of times the compressor 46 is turned off reaches the predetermined value, the additional dry cycle is terminated, but this is merely an example. That is, according to various embodiments, the number of times the compressor 46 is turned off and the temperature of the air inside the drum 110 that turns off the compressor 46 may be set to be varied depending on a dry level, a dry temperature, and the like. This will be described in more detail with reference to FIGS. 7 and 8.

FIG. 7 is a view illustrating a method of performing a dry cycle according to an embodiment of the disclosure.

In FIG. 7, operations of S710, S715, S725, S730, S735, S740, S745, S755 and S760 are the same as S510, S515, S525, S530, S535, S540, S545, S555 and S560 in FIG. 5, and thus, a detailed description will be omitted. In addition, although FIG. 7 does not show the operation of determining whether a specific time has elapsed since the start of the dry cycle (e.g., S520 in FIG. 5), this operation may also be performed in FIG. 7.

Referring to FIG. 7, the processor 160 may receive a user input for selecting a dry level (S705).

For example, the user may select a blanket dry course and may select a dry level by selecting a button provided on the operating part 15-1 or using an operation dial provided in the operating part 15-1.

Here, dry level may include a first level (e.g., standard) and a second level (e.g., strong) higher in dry level than the first level.

Meanwhile, after starting the additional dry cycle, the processor 160 may determine whether the dry level selected by the user corresponds to the first level (S770).

In this case, when dry level corresponds to the first level, the processor 160 may determine whether the additional dry time has been completed or whether a control state of the compressor 46 satisfies a specific first condition (S780). If the additional dry time has been completed or the control condition of the compressor 46 satisfies the first specific condition (S780-Y), the processor may terminate the dry cycle (S755).

Here, the specific first condition may include whether the number of times the compressor 46 was turned off has reached a predetermined value (e.g., three times).

If the dry level corresponds to the second level, the processor 160 may determine whether the additional dry time has been completed or the control state of the compressor 46 satisfies the first specific condition (S790), If the additional dry time has been completed or if the control condition of the compressor 46 satisfies the specified second condition (S790-Y), the dry cycle may be terminated (S755).

Here, the specific second condition may include whether the number of times the compressor 46 was turned off has reached a predetermined value (e.g., five times).

As described above, according to an embodiment of the disclosure, the number of times that the compressor 46 is turned off, which is required for termination of the dry cycle according to levels of a dry level, may be set to be different. That is, the number of times the compressor 46 is turned off required for termination of the dry cycle may be increased as the level of dry level is higher.

Thus, a more efficient dry cycle may be performed to meet a dry level requested by the user.

FIG. 8 is a view illustrating a method of performing a dry cycle according to an embodiment of the disclosure.

The operations of S810, S815, S825, S830, S835, S840, S845, S855 and S860 are the same as S510, S515, S525, S530, S535, S540, S545, S555 and S560 in FIG. 5, and thus, a detailed description thereof will be omitted. In addition, although the operation of determining whether a specific time has elapsed since the dry cycle was started. (e.g., S520 of FIG. 5) is not illustrated, such an operation may also be performed in FIG. 8.

Referring to FIG. 8, the processor 160 may receive a user input for selecting a dry temperature (S805).

For example, the user may select a blanket dry course and select a dry temperature by selecting a button provided in the operating part 15-1 or using an operation dial provided in the operating part 15-1.

Here, the dry temperature may include a first temperature medium temperature) and a second temperature (e.g., low temperature) lower than the first temperature.

Meanwhile, after starting the additional dry cycle, the processor 160 may determine whether the dry temperature selected by the user corresponds to the first temperature (S870).

In this case, when the dry temperature is the first temperature, the processor 160 may determine whether the additional dry time has been completed or whether a control state of the compressor 46 satisfies the first specific condition (S880). If the additional dry time has been completed or the control condition of the compressor 46 satisfies the first specific condition (S880-Y), the processor 160 tray terminate the dry cycle (S855).

Here, the specific first condition may include whether the number of times the compressor 46 has been turned off has reached a predetermined value (e.g., three tunes).

Meanwhile, the temperature of the air inside the drum 110 gradually increases with the driving of the compressor 46 during the dry cycle. In this case, the processor 160 may determine whether the temperature of the air inside the drum 110 has reached a predetermined target temperature on the basis of the temperature sensed by the second sensor 130, and turn off the compressor 46 when it is determined that the temperature of the air inside the drum 110 has reached to the predetermined target temperature.

More specifically, the processor 160 may turn off the compressor 46 being driven if the temperature sensed by the second sensor 130 is the predetermined first temperature. For example, the processor 160 may turn off the compressor 46 when the temperature sensed by the second sensor 130 gradually increases to reach 57° C.

Meanwhile, when driving of the compressor 46 is stopped, the temperature of the air inside the drum 110 gradually decreases and the temperature sensed by the second sensor 130 also gradually decreases.

In this case, the processor 160 may turn off the compressor 46 when the temperature sensed by the second sensor 130 is the predetermined second temperature. For example, the processor 160 may turn on the compressor 46 in the OFF state when the temperature sensed by the second sensor 130 gradually decreases to 56° C.

Thus, when the dry temperature is selected as the first temperature, the temperatures used for the ON/FF control of the compressor 46 may be set to 57° C. and 56° C.

If the dry temperature is the second temperature, the processor 160 may determine whether the additional dry time is completed or whether the control state of the compressor 46 satisfies a specific second condition (S890). If the additional dry time is completed or the control state of the compressor 46 satisfies the specified second condition (S890-Y), the processor 160 may terminate the dry cycle (S855).

Here, the specific second condition may correspond to whether the number of times the compressor 46 is turned off reaches a predetermined value (e.g., seven times).

Meanwhile, the temperature of the air inside the drum 110 gradually increases with the driving of the compressor 46 during the dry cycle. In this case, the processor 160 may determine whether the temperature of the air inside the drum 110 has reached the predetermined target temperature on the basis of the temperature sensed by the second sensor 130, and turn off the compressor 47 when the temperature of the air inside the drum 110 has reached to the predetermined target temperature.

More specifically, the processor 160 may turn off the compressor 46 being driven if the temperature sensed by the second sensor 130 is the predetermined first temperature. For example, the processor 160 may turn off the compressor 46 when the temperature sensed by the second sensor 130 gradually increases to reach 50° C.

Meanwhile, when the driving of the compressor 46 is stopped, the temperature of the air inside the drum 110 gradually decreases and the temperature sensed by the second sensor 130 also gradually decreases.

In this case, the processor 160 may turn on the compressor 46 in an OFF state when the temperature sensed by the second sensor 130 is the predetermined second temperature. For example, the processor 160 may turn on the compressor 46 in the OFF state when the temperature sensed by the second sensor 130 gradually decreases to reach 49° C.

Thus, when the dry temperature is selected as the second temperature, the temperatures used for ON/OFF control of the compressor 46 may be set to 50° C. and 49° C.

As a result, according to an embodiment of the disclosure, the number of tunes the compressor 46 is turned off required for termination of the additional dry cycle and the temperature of the air inside the drum 110 for turning off the compressor 46 may be set to be different according to dry temperatures. That is, the number of times the compressor 46 is turned off required for termination of the dry cycle may be set to be larger and the temperature of the air inside the drum 110 for turning off the compressor 46 is set to be lower as the dry temperature is lower.

Accordingly, a more efficient dry cycle may be performed to meet the dry temperature requested by the user.

According to various embodiments of the disclosure, the dry cycle may be performed in various manners depending on the type of the dry object, and this will be described in detail with reference to FIG. 9.

FIG. 9 is a view illustrating a method of performing a dry cycle according to an embodiment of the disclosure.

In FIG. 9, pre-processing, the dry cycle, reverse rotation of the drum 110, the additional dry cycle, and the like, are the same as those described above in FIG. 5, so a detailed description of the redundant portions will be omitted.

Referring to FIG. 9, the processor 160 may receive a user input for selecting a type of a dry object (S905).

Here, the type of the dry object may include a first type, a second type, and a third type. In this case, for example, the first type may include a blanket, the second type may include a pillow and a cushion, and the third type may include clothes (paddings).

Meanwhile, the user input for selecting the type of the dry object may be input by selecting a button provided on the operating part 15-1 or through an operation dial provided on the operating part 15-1.

For example, the user may select the first type by selecting a blanket dry course, select the second type by selecting a cushion dry course, and select the third type by selecting a clothes dry course.

First, when the type of the dry object is selected as the first type (i.e., a blanket), the processor 160 may perform pre-processing and the dry cycle (S911, 912) and determine whether a pulse value sensed by the first sensor 120 is equal to or less than the predetermined value S₁ (S913). Here, the predetermined value S1 may be 0 or a value close to 0, for example.

If the pulse value sensed by the first sensor 120 is equal to or less than the predetermined value S1 (S913-Y) the processor 160 may reversely rotate the drum 110 for t₁ seconds (e.g., 10 seconds) (S914) and perform the dry cycle again (S915).

Then, the processor 160 may determine whether the pulse value sensed by the first sensor 120 is equal to or less than the predetermined value S₁ (S916). Here, the predetermined value S₁ may be 0 or a value close to 0, for example.

Thereafter, when the pulse value sensed by the first sensor 120 is equal to or less than the predetermined value S₁, the processor 160 may determine a time for additionally performing the dry cycle and perform the additional dry cycle for the determined time (S940). Here, the processor 160 may reversely rotate the drum 110 for a predetermined time (t₁ seconds) at every specific time period (T₂ minutes) during the dry cycle.

Meanwhile, when the predetermined time for performing the dry cycle has elapsed or when a control state of the compressor 46 satisfies a specific condition (S950-Y), the processor 160 may terminate the dry cycle (S970) and perform a cooling process (S980).

Here, the specific condition may include a condition that the compressor 46 is terminated a predetermined number of times. For example, the processor 160 may terminate the dry cycle if the compressor 46 is turned off three times during the additional dry cycle.

When the type of the dry object is selected as the second type (e.g., pillow or cushion), the processor 160 may perform pre-processing and the dry cycle (S921 and 922) and determine whether a pulse value sensed by the first sensor 120 is equal to or less than the predetermined value S₂ (S923). Here, the predetermined value S₂ may be 5 or a value close to 5, for example.

When the pulse sensed by the first sensor 120 is equal to or less than the predetermined value S₂ (S923-Y), the processor 160 may reversely rotate the drum 110 for t₁ seconds (e.g., 10 seconds) (S924) and perform the dry cycle again (S925).

Thereafter, the processor 160 may determine whether the pulse value sensed by the first sensor 120 is equal to or less than the predetermined value S₂ (S926). Here, the predetermined value S₂ may be 5 or a value close to 5, for example.

Thereafter, if the pulse value sensed by the first sensor 120 is equal to or less than the predetermined value S₂, the processor 160 may determine a time for additionally performing the dry cycle and perform the additional dry cycle for the determined time (S945). Here, the processor 160 may reversely rotate the drum 110 for a predetermined time (t₁ seconds) (e.g., 10 seconds) at every predetermined time period (T₂ minutes) (e.g., 10 minutes) during the dry cycle.

If the predetermined time set for additionally performing the dry cycle has elapsed (S960-Y), the processor 160 may terminate the dry cycle (S970) and proceeds with the cooling process (S980).

Meanwhile, when the type of the dry object is selected as the third type (e.g., clothes (paddings)), the processor 160 may performs pre-processing and the dry cycle (S931, 932) and determine whether the sensed pulse value is equal to or less than a predetermined value S₃ (S933). Here, the predetermined value S₃ may be 10 or a value close to 10, for example.

If the pulse value sensed by the first sensor 120 is equal to or less than the predetermined value S₃ (S933-Y), the processor 160 may reversely rotate the drum 110 for t₁ seconds 10 seconds) (S934) and perform the dry cycle again (S935).

Thereafter, the processor 160 may determine whether the pulse value sensed by the first sensor 120 is equal to or less than the predetermined value S₃ (S936). Here, the predetermined value S₃ may be 10 or a value close to 10, for example.

Thereafter, when the pulse value sensed by the first sensor 120 is equal to or less than the predetermined value S₃, the processor 160 may determine a time for additionally performing the dry cycle and perform the additional dry cycle for the determined time (S945). Here, the processor 160 may reversely rotate the drum 110 for a predetermined time (t₁ seconds) (e.g., 10 seconds) at every predetermined time period (T₂ minutes) (e.g., 10 minutes) during the dry cycle.

If the predetermined time set for additionally performing the dry cycle has elapsed (S960-Y), the processor 160 may terminate the dry cycle (S970) and proceed with the cooling process (S980).

Meanwhile, the processor 160 may determine a time for additionally performing the dry cycle according to types of dry objects. Here, the processor 160 may determine a time for additionally performing the dry cycle using the time which has elapsed since the start of the dry cycle and information stored in a memory (not shown).

Here, the information stored in the memory (not shown) indicates for how long the dry cycle is to be additionally performed according to the measured elapsed time, for example, as illustrated in Table 2 below. The values were experimentally measured for optimal drying of the dry object.

TABLE 2 Measured elapsed Additional dry time for Additional dry time for Additional dry time for time (T) blanket pillow and cushion paddings or clothes T ≤ 8 minutes 110 minutes − measured 60 minutes − measured 40 minutes − measured elapsed time (T) elapsed time (T) elapsed time (T) 8 minutes < T ≤ 15 140 minutes − measured 75 minutes − measured 50 minutes − measured minutes elapsed time (T) elapsed time (T) elapsed time (T) 15 minutes < T ≤ 20 170 minutes − measured 90 minutes − measured 60 minutes − measured minutes elapsed time (T) elapsed time (T) elapsed time (T) 20 minutes < T ≤ 25 200 minutes − measured 105 minutes − measured 70 minutes − measured minutes elapsed time (T) elapsed time (T) elapsed time (T) 25 minutes < T 230 minutes − measured 120 minutes − measured 80 minutes − measured elapsed time (T) elapsed time (T) elapsed time (T)

As described above, according to the embodiment of the disclosure, time points for reversely rotating the drum 110 may be different according to types of dry objects. That is, in consideration of the fact that a thickness, a material, a filler, and the like, of dry objects vary according to the types thereof, the drum 110 may be reversely rotated in a state in which paddings (clothes), pillow/cushions, and blanket are more dried in this order. In this case, the time for additional dry cycle may also be set to be longer in order of paddings (clothes), pillows/cushions, and blanket.

Thus, a more efficient dry cycle may be performed depending on the type of the dry object.

FIG. 10 is a flowchart illustrating a drying method of a dryer according to an embodiment of the disclosure.

Here, the dryer may include a drum that receives a dry object, a first sensor sensing a dry state of the dry object contained in the drum, and a second sensor sensing a temperature of air discharged from the drum.

First, when a user input for selecting a specific course is received, a dry cycle is performed (S1010).

After the dry cycle is started, a rotation direction of the drum is controlled on the basis of the dry state of the dry object sensed by the first sensor (S1020).

Thereafter, termination of the dry cycle is controlled on the basis of the temperature of the air sensed by the second sensor (S1030).

Specifically, in operation S1020, the rotation direction of the drum may be changed on the basis of the dry state of the dry object sensed by the first sensor. That is, in operation S1020, during the dry cycle, the drum may be rotated in a first direction, and if a value indicating the dry state of the dry object sensed by the first sensor is equal to or less than a predetermined value, the drum may be rotated in a second direction opposite to the first direction for a predetermined time. In this case, the dry cycle may be performed again when a predetermined time has elapsed.

Meanwhile, if the value indicating the dry state of the dry object sensed by the first sensor is equal to or less than the predetermined value after the dry cycle is performed again, a time for additionally performing the dry cycle may be determined on the basis of the time which has elapsed since the start of the dry cycle, and the dry cycle may be additionally performed for the determined time.

In this case, in the additional thy cycle, the drum may be rotated in the second direction for a predetermined time.

The dryer may further include a compressor for heating air supplied into the drum.

In this case, in the dry cycle performed after the rotation direction of the drum is controlled, ON/OFF of the compressor may be controlled on the basis of a temperature sensed by the second sensor and termination of the dry cycle may be controlled on the basis of a control state of the compressor.

Here, the dry cycle, which is performed after the rotation direction of the drum is controlled, may be set to be performed for a time determined on the basis of the time which has elapsed since the start of the dry cycle.

In operation S1030, if the number of times the compressor is turned off is a predetermined value, the dry cycle may be terminated even before the determined time has elapsed.

In this case, if the temperature sensed by the second sensor is a predetermined first temperature, the compressor being driven is turned off, and if the temperature sensed by the second sensor after the compressor is turned off is a predetermined second temperature, the compressor in the OFF state may be turned on.

The drying method of such a dryer has been described in detail above.

A non-transitory computer readable medium storing a program for sequentially performing the drying method according to the disclosure may be provided.

The non-transitory computer readable medium refers to a medium which semi-permanently stores data, rather than a medium which stores data for a short period of time, such as a register, a cache, a memory, etc., and which is readable by a device. Specifically, the various applications or programs described above may be stored in the non-transitory computer readable medium such as CD, DVD, hard disk, Blu-ray disk, USB, memory card, ROM, and the like.

Also, although a bus is not illustrated in the above-described block diagram of the dryer, communication between the components of the dryer may be performed through the bus. In addition, the dryer may further include a processor such as a CPU, a microprocessor, or the like, that performs the various steps described above.

While the disclosure has been described and illustrated with reference to the embodiments, the disclosure is not limited to the above-described specific embodiments, and it will be understood that various modifications and variations may be made therein by those skilled in the art to which the disclosure pertains, without departing from the scope of the disclosure as defined by the appended claims. These modifications and variations should not be understood separately from the technical spirit and prospect of the disclosure.

According to various embodiments of the disclosure as described above, an occurrence of detective dry due to non-dry may be prevented by changing the rotation direction of the drum to more accurately sense a dry state of the dry object. In addition, because termination of the dry cycle is controlled on the basis of the temperature of the air discharged from the drum, accuracy of predicting the dry level of the dry object may be increased to thus prevent damage to the dry object and energy loss caused by overdrying. 

What is claimed is:
 1. A dryer comprising: a drum configured to receive a dry object; a first sensor configured to sense a dry state of the dry object received in the drum; a heater configured to heat air supplied into the drum; a blower configured to form a flow of air passing through the inside of the drum; a second sensor configured to sense a temperature of air discharged from the drum; and a processor configured to, in response to a user input selecting a specific course of operation of the dryer being received, control the drum, the heater, and the blower to perform a dry cycle, control a rotation direction of the drum on the basis of a dry state of the dry object sensed by the first sensor after the dry cycle is started, and control termination of the dry cycle on the basis of a temperature of air sensed by the second sensor.
 2. The dryer as claimed in claim 1, wherein the processor is configured to change the rotation direction of the drum on the basis of the dry state of the dry object sensed by the first sensor.
 3. The dryer as claimed in claim 2, wherein the processor is configured to rotate the drum in a first direction during the dry cycle, rotate the drum in a second direction opposite to the first direction for a predetermined time in response to a value indicating the dry state of the dry object sensed by the first sensor being equal to or less than a predetermined value, and additionally perform the dry cycle when the predetermined time elapses.
 4. The dryer as claimed in claim 3, wherein, in response to the value indicating the dry state of the dry object sensed by the first sensor being equal to or less than the predetermined value after the dry cycle is additionally performed, the processor is configured to determine a time for which the dry cycle is to be further additionally performed on the basis of a time which has elapsed since the start of the dry cycle, and further additionally perform the dry cycle for the determined time.
 5. The dryer as claimed in claim 4, wherein the processor is configured to rotate the drum in the second direction for the predetermined time at a specific predetermined time period during the further additionally performed dry cycle.
 6. The dryer as claimed in claim 1, wherein the heater includes a compressor configured to heat air supplied into the drum.
 7. The dryer as claimed in claim 6, wherein the processor is configured to control ON/OFF of the compressor on the basis of a temperature sensed by the second sensor during the dry cycle performed after the rotation direction of the drum is controlled, and control termination of the dry cycle on the basis of a control state of the compressor.
 8. The dryer as claimed in claim 7, wherein the dry cycle performed after the rotation direction of the drum is controlled is set to be performed for a time determined on the basis of the time which has elapsed from the time point at which the dry cycle was started.
 9. The dryer as claimed in claim 8, wherein, in response to the number of times the compressor is turned off being a predetermined value, the processor is configured to terminate the dry cycle even before the determined time elapsed.
 10. The dryer as claimed in claim 9, wherein the processor is configured to turn off the compressor in operation in response to the temperature sensed by the second sensor being a predetermined first temperature, and in response to a temperature sensed by the second sensor after the compressor is turned off being a predetermined second temperature, the processor is configured to turn on the compressor which is in an OFF state.
 11. A drying method of a dryer including a drum configured to receive a dry object, a first sensor configured to sense a dry state of the dry object received in the drum, and a second sensor configured to sense a temperature of air discharged from the drum, the drying method comprising: in response to a user input selecting a specific course of operation of the dryer being received, performing, by the dryer, a dry cycle, controlling a rotation direction of the drum on the basis of a dry state of the dr object sensed by the first sensor after the dry cycle is started, and controlling termination of the dry cycle on the basis of a temperature of air sensed by the second sensor.
 12. The drying method as claimed in claim 11, wherein the controlling of a rotation direction includes changing the rotation direction of the drum on the basis of the dry state of the dry object sensed by the first sensor.
 13. The drying method as claimed in claim 12, wherein the controlling of a rotation direction includes rotating the drum in a first direction during the dry cycle and rotating the drum in a second direction opposite to the first direction for a predetermined time in response to a value indicating the dry state of the dry object sensed by the first sensor being equal to or less than a predetermined value, wherein the drying method further comprising: resuming the dry cycle after the lapse of the predetermined time to thereby additional perform the dry cycle.
 14. The drying method as claimed in claim 13, further comprising: in response to a value indicating the dry state of the dry object sensed by the first sensor being equal to or less than the predetermined value after the dry cycle is additionally performed, determining a time for which the dry cycle is to be further additionally performed on the basis of a time which has elapsed since the start of the dry cycle, and further additionally performing the dry cycle for the determined time.
 15. The drying method as claimed in claim 14, wherein the further additionally performing of the dry cycle further includes: rotating the drum in the second direction for the predetermined time at a specific predetermined time period during the further additionally performed dry cycle.
 16. The drying method as claimed in claim 11, wherein the dryer further includes a compressor for heating the air supplied into the drum by a compressor.
 17. The drying method as claimed in claim 16, wherein the controlling of termination of the dry cycle includes: controlling ON/OFF of the compressor on the basis of the temperature sensed by the second sensor during the dry cycle performed after the rotation direction of the drum is controlled, and controlling termination of the dry cycle on the basis of a control state of the compressor.
 18. The drying method as claimed in claim 17, wherein the dry cycle performed after the rotation direction of the drum is controlled is set to be performed for a time determined on the basis of the time which has elapsed from the time point at which the dry cycle was started.
 19. The drying method as claimed in claim 18, wherein in the controlling of termination of the dry cycle, in response to the number of times the compressor is turned off being a predetermined value, the dry cycle is terminated even before the determined time has elapsed.
 20. The drying method as claimed in claim 19, further comprising: turning off the compressor in operation in response to the temperature sensed by the second sensor being a predetermined first temperature, and turning on the compressor which is in an OFF state in response to the temperature sensed by the second sensor after the compressor is turned off being a predetermined second temperature. 